/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:34:47,567 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:34:47,575 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:34:47,605 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:34:47,606 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:34:47,609 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:34:47,613 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:34:47,628 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:34:47,632 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:34:47,634 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:34:47,639 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:34:47,641 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:34:47,642 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:34:47,647 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:34:47,652 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:34:47,654 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:34:47,656 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:34:47,659 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:34:47,664 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:34:47,673 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:34:47,681 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:34:47,687 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:34:47,689 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:34:47,690 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:34:47,697 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:34:47,707 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:34:47,709 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:34:47,709 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:34:47,711 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:34:47,729 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:34:47,730 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:34:47,731 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:34:47,732 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:34:47,732 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:34:47,733 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:34:47,733 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:34:47,733 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:34:47,733 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:34:47,733 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:34:47,734 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:34:47,734 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:34:47,734 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:34:47,734 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:34:47,735 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:34:47,735 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:34:47,735 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:34:47,735 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:34:47,736 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:34:47,736 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:34:47,736 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:34:47,736 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:34:47,737 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:34:47,737 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:34:47,737 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:34:47,737 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:34:47,738 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:47,738 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:34:47,738 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:34:47,738 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:34:48,179 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:34:48,198 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:34:48,203 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:34:48,206 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:34:48,206 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:34:48,207 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-20 13:34:48,290 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/054707487/fd946cbba4994fec94da94494f95544f/FLAG71ed0f227 [2020-07-20 13:34:48,974 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:34:48,974 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-20 13:34:48,986 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/054707487/fd946cbba4994fec94da94494f95544f/FLAG71ed0f227 [2020-07-20 13:34:49,233 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/054707487/fd946cbba4994fec94da94494f95544f [2020-07-20 13:34:49,257 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:34:49,263 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:34:49,270 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:34:49,271 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:34:49,278 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:34:49,281 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,288 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a1aa79a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49, skipping insertion in model container [2020-07-20 13:34:49,289 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,307 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:34:49,344 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:34:49,623 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:34:49,633 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:34:49,654 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:34:49,673 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:34:49,674 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49 WrapperNode [2020-07-20 13:34:49,675 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:34:49,676 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:34:49,677 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:34:49,677 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:34:49,700 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,701 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,710 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,711 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,849 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,852 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,857 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,861 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:34:49,862 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:34:49,862 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:34:49,863 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:34:49,868 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:34:49,964 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:34:49,964 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:34:49,964 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 13:34:49,965 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 13:34:49,965 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:34:49,965 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:34:49,965 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:34:49,965 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 13:34:49,967 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 13:34:49,968 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:34:49,969 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:34:49,969 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:34:50,252 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:34:50,253 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:34:50,259 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:34:50 BoogieIcfgContainer [2020-07-20 13:34:50,260 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:34:50,262 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:34:50,263 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:34:50,268 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:34:50,269 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:34:49" (1/3) ... [2020-07-20 13:34:50,270 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@382c296a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:34:50, skipping insertion in model container [2020-07-20 13:34:50,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (2/3) ... [2020-07-20 13:34:50,272 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@382c296a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:34:50, skipping insertion in model container [2020-07-20 13:34:50,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:34:50" (3/3) ... [2020-07-20 13:34:50,279 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-2.c [2020-07-20 13:34:50,296 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:34:50,311 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:34:50,346 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:34:50,396 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:34:50,396 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:34:50,396 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:34:50,396 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:34:50,397 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:34:50,397 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:34:50,397 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:34:50,397 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:34:50,455 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 13:34:50,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:34:50,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:50,480 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:50,481 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:50,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:50,492 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 13:34:50,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:50,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892532422] [2020-07-20 13:34:50,510 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:50,617 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:50,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:50,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:34:50,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:50,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:34:50,744 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:34:50,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892532422] [2020-07-20 13:34:50,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:34:50,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:34:50,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682618216] [2020-07-20 13:34:50,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:34:50,760 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:50,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:34:50,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:34:50,783 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 13:34:50,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:50,955 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 13:34:50,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:34:50,960 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:34:50,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:50,982 INFO L225 Difference]: With dead ends: 44 [2020-07-20 13:34:50,982 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 13:34:50,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:34:51,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 13:34:51,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 13:34:51,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:34:51,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:34:51,066 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 13:34:51,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:51,067 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:34:51,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:34:51,067 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:34:51,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:34:51,071 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:51,071 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:51,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:51,287 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:51,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:51,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 13:34:51,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:51,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702525288] [2020-07-20 13:34:51,290 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:51,360 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:51,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:51,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:34:51,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:51,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:34:51,440 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:34:51,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702525288] [2020-07-20 13:34:51,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:34:51,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:34:51,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160295908] [2020-07-20 13:34:51,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:34:51,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:51,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:34:51,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:34:51,447 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 13:34:51,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:51,567 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 13:34:51,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:34:51,569 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:34:51,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:51,571 INFO L225 Difference]: With dead ends: 36 [2020-07-20 13:34:51,572 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 13:34:51,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:34:51,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 13:34:51,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 13:34:51,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:34:51,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:34:51,587 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 13:34:51,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:51,588 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:34:51,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:34:51,589 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:34:51,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:34:51,591 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:51,591 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:51,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:51,808 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:51,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:51,809 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 13:34:51,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:51,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96446262] [2020-07-20 13:34:51,811 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:51,851 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:51,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:51,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:34:51,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:51,936 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:51,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:52,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:52,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:52,262 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:52,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96446262] [2020-07-20 13:34:52,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:52,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:34:52,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350095625] [2020-07-20 13:34:52,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:34:52,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:52,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:34:52,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:34:52,266 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 13:34:52,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:52,445 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 13:34:52,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:34:52,446 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 13:34:52,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:52,449 INFO L225 Difference]: With dead ends: 41 [2020-07-20 13:34:52,449 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 13:34:52,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:52,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 13:34:52,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 13:34:52,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:34:52,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:34:52,464 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 13:34:52,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:52,464 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:34:52,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:34:52,465 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:34:52,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:34:52,467 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:52,468 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:52,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:52,684 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:52,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:52,685 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 13:34:52,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:52,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [226416286] [2020-07-20 13:34:52,687 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:52,724 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:52,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:52,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:34:52,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:52,793 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:52,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:53,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:53,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:53,103 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:53,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [226416286] [2020-07-20 13:34:53,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:53,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:34:53,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541086800] [2020-07-20 13:34:53,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:34:53,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:53,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:34:53,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:34:53,110 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 13:34:53,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:53,335 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 13:34:53,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:34:53,336 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 13:34:53,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:53,341 INFO L225 Difference]: With dead ends: 46 [2020-07-20 13:34:53,346 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 13:34:53,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:53,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 13:34:53,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 13:34:53,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:34:53,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:34:53,379 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 13:34:53,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:53,381 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:34:53,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:34:53,386 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:34:53,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:34:53,391 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:53,392 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:53,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:53,607 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:53,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:53,608 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 13:34:53,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:53,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115176546] [2020-07-20 13:34:53,609 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:53,652 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:53,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:53,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:34:53,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:53,771 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:34:53,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:54,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:54,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:54,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:54,272 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:34:54,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115176546] [2020-07-20 13:34:54,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:54,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:34:54,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928207769] [2020-07-20 13:34:54,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:34:54,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:54,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:34:54,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:54,277 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 13:34:54,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:54,484 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 13:34:54,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:34:54,484 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 13:34:54,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:54,487 INFO L225 Difference]: With dead ends: 51 [2020-07-20 13:34:54,487 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 13:34:54,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:34:54,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 13:34:54,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 13:34:54,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:34:54,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:34:54,505 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 13:34:54,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:54,506 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:34:54,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:34:54,508 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:34:54,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 13:34:54,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:54,512 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:54,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:54,724 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:54,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:54,724 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 13:34:54,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:54,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [252171162] [2020-07-20 13:34:54,726 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:54,775 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:54,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:54,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:34:54,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:54,829 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 13:34:54,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:55,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:55,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:55,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:55,192 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:34:55,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [252171162] [2020-07-20 13:34:55,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:55,193 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:34:55,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068644119] [2020-07-20 13:34:55,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:34:55,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:55,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:34:55,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:55,195 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 13:34:55,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:55,372 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 13:34:55,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:34:55,373 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 13:34:55,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:55,375 INFO L225 Difference]: With dead ends: 56 [2020-07-20 13:34:55,376 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 13:34:55,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:34:55,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 13:34:55,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 13:34:55,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:34:55,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:34:55,389 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 13:34:55,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:55,390 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:34:55,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:34:55,390 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:34:55,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 13:34:55,393 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:55,393 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:55,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:55,609 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:55,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:55,610 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 13:34:55,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:55,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [287526274] [2020-07-20 13:34:55,610 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:55,648 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:55,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:55,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:34:55,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:55,722 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 13:34:55,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:56,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,320 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:34:56,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [287526274] [2020-07-20 13:34:56,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:56,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:34:56,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212114340] [2020-07-20 13:34:56,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:34:56,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:56,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:34:56,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:34:56,323 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 13:34:56,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:56,545 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 13:34:56,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:34:56,546 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 13:34:56,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:56,551 INFO L225 Difference]: With dead ends: 61 [2020-07-20 13:34:56,551 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 13:34:56,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:34:56,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 13:34:56,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 13:34:56,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:34:56,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:34:56,595 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 13:34:56,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:56,596 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:34:56,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:34:56,596 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:34:56,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 13:34:56,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:56,598 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:56,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:56,813 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:56,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:56,814 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 13:34:56,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:56,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [383989220] [2020-07-20 13:34:56,815 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:56,878 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:56,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:56,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:34:56,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:56,954 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 13:34:56,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:57,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,523 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:34:57,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [383989220] [2020-07-20 13:34:57,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:57,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:34:57,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682330572] [2020-07-20 13:34:57,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:34:57,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:57,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:34:57,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:34:57,528 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 13:34:57,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:57,748 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 13:34:57,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:34:57,748 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 13:34:57,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:57,751 INFO L225 Difference]: With dead ends: 66 [2020-07-20 13:34:57,752 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 13:34:57,753 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:34:57,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 13:34:57,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 13:34:57,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:34:57,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:34:57,766 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 13:34:57,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:57,766 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:34:57,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:34:57,767 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:34:57,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 13:34:57,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:57,769 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:57,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:57,986 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:57,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:57,987 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 13:34:57,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:57,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1867860441] [2020-07-20 13:34:57,989 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:58,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:58,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:58,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:34:58,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:58,169 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 13:34:58,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:58,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:59,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:59,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:59,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:59,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:59,124 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 13:34:59,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1867860441] [2020-07-20 13:34:59,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:59,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 13:34:59,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380169843] [2020-07-20 13:34:59,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:34:59,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:59,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:34:59,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:34:59,127 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 13:34:59,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:59,412 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 13:34:59,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:34:59,413 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 13:34:59,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:59,415 INFO L225 Difference]: With dead ends: 71 [2020-07-20 13:34:59,416 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 13:34:59,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:34:59,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 13:34:59,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 13:34:59,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:34:59,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:34:59,431 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 13:34:59,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:59,432 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:34:59,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:34:59,432 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:34:59,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 13:34:59,434 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:59,434 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:59,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:59,650 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:59,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:59,650 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 13:34:59,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:59,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1462350868] [2020-07-20 13:34:59,652 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:59,722 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:59,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:59,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:34:59,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:59,836 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 13:34:59,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:00,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,867 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 13:35:00,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1462350868] [2020-07-20 13:35:00,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:00,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:35:00,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868144482] [2020-07-20 13:35:00,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:35:00,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:00,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:35:00,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:35:00,872 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 15 states. [2020-07-20 13:35:01,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:01,156 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 13:35:01,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:35:01,157 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 108 [2020-07-20 13:35:01,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:01,159 INFO L225 Difference]: With dead ends: 76 [2020-07-20 13:35:01,160 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 13:35:01,163 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:35:01,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 13:35:01,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 13:35:01,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:35:01,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:35:01,196 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 13:35:01,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:01,199 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:35:01,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:35:01,199 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:35:01,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 13:35:01,205 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:01,206 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:01,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:01,423 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:01,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:01,423 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 13:35:01,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:01,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1038758058] [2020-07-20 13:35:01,424 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:01,522 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:01,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:01,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:01,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:01,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-20 13:35:01,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:02,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-20 13:35:03,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1038758058] [2020-07-20 13:35:03,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:03,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:35:03,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899071966] [2020-07-20 13:35:03,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:35:03,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:03,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:35:03,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:03,652 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 17 states. [2020-07-20 13:35:03,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:03,965 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 13:35:03,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:03,966 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 208 [2020-07-20 13:35:03,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:03,968 INFO L225 Difference]: With dead ends: 81 [2020-07-20 13:35:03,969 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 13:35:03,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:35:03,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 13:35:03,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 13:35:03,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 13:35:03,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 13:35:03,982 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 13:35:03,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:03,983 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 13:35:03,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:35:03,984 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 13:35:03,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-20 13:35:03,986 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:03,986 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:04,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:04,199 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:04,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:04,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1298373331, now seen corresponding path program 2 times [2020-07-20 13:35:04,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:04,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819702300] [2020-07-20 13:35:04,201 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:04,287 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:04,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:04,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:04,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:04,396 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 156 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 13:35:04,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:05,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,440 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 164 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-20 13:35:05,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819702300] [2020-07-20 13:35:05,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:05,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:35:05,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438317851] [2020-07-20 13:35:05,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:35:05,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:05,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:35:05,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:35:05,444 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 15 states. [2020-07-20 13:35:05,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:05,672 INFO L93 Difference]: Finished difference Result 99 states and 221 transitions. [2020-07-20 13:35:05,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:35:05,674 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-20 13:35:05,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:05,678 INFO L225 Difference]: With dead ends: 99 [2020-07-20 13:35:05,678 INFO L226 Difference]: Without dead ends: 95 [2020-07-20 13:35:05,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 272 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:35:05,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-20 13:35:05,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 57. [2020-07-20 13:35:05,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 13:35:05,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 92 transitions. [2020-07-20 13:35:05,701 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 92 transitions. Word has length 148 [2020-07-20 13:35:05,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:05,702 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 92 transitions. [2020-07-20 13:35:05,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:35:05,702 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 92 transitions. [2020-07-20 13:35:05,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-20 13:35:05,705 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:05,706 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:05,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:05,919 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:05,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:05,920 INFO L82 PathProgramCache]: Analyzing trace with hash 2095197631, now seen corresponding path program 1 times [2020-07-20 13:35:05,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:05,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2037916812] [2020-07-20 13:35:05,921 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:06,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:06,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:06,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:35:06,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:06,066 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 89 refuted. 0 times theorem prover too weak. 221 trivial. 0 not checked. [2020-07-20 13:35:06,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:06,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,697 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 94 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2020-07-20 13:35:06,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2037916812] [2020-07-20 13:35:06,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:06,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 13:35:06,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409050478] [2020-07-20 13:35:06,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:35:06,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:06,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:35:06,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:35:06,702 INFO L87 Difference]: Start difference. First operand 57 states and 92 transitions. Second operand 13 states. [2020-07-20 13:35:06,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:06,886 INFO L93 Difference]: Finished difference Result 99 states and 217 transitions. [2020-07-20 13:35:06,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:06,887 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 123 [2020-07-20 13:35:06,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:06,889 INFO L225 Difference]: With dead ends: 99 [2020-07-20 13:35:06,889 INFO L226 Difference]: Without dead ends: 95 [2020-07-20 13:35:06,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 226 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:06,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-20 13:35:06,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 59. [2020-07-20 13:35:06,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 13:35:06,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 98 transitions. [2020-07-20 13:35:06,901 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 98 transitions. Word has length 123 [2020-07-20 13:35:06,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:06,901 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 98 transitions. [2020-07-20 13:35:06,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:35:06,901 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 98 transitions. [2020-07-20 13:35:06,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2020-07-20 13:35:06,904 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:06,904 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 11, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:07,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:07,118 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:07,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:07,119 INFO L82 PathProgramCache]: Analyzing trace with hash 1017418174, now seen corresponding path program 1 times [2020-07-20 13:35:07,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:07,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941356413] [2020-07-20 13:35:07,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:07,243 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:07,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:07,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:07,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:07,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 114 proven. 290 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2020-07-20 13:35:07,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:08,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,089 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 116 proven. 304 refuted. 0 times theorem prover too weak. 829 trivial. 0 not checked. [2020-07-20 13:35:09,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941356413] [2020-07-20 13:35:09,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:09,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:35:09,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789608177] [2020-07-20 13:35:09,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:35:09,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:09,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:35:09,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:09,091 INFO L87 Difference]: Start difference. First operand 59 states and 98 transitions. Second operand 17 states. [2020-07-20 13:35:09,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:09,450 INFO L93 Difference]: Finished difference Result 113 states and 271 transitions. [2020-07-20 13:35:09,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:09,450 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 216 [2020-07-20 13:35:09,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:09,456 INFO L225 Difference]: With dead ends: 113 [2020-07-20 13:35:09,456 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 13:35:09,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 403 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:35:09,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 13:35:09,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-07-20 13:35:09,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-20 13:35:09,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 104 transitions. [2020-07-20 13:35:09,475 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 104 transitions. Word has length 216 [2020-07-20 13:35:09,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:09,476 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 104 transitions. [2020-07-20 13:35:09,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:35:09,477 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 104 transitions. [2020-07-20 13:35:09,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-20 13:35:09,480 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:09,480 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:09,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:09,694 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:09,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:09,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1521837768, now seen corresponding path program 2 times [2020-07-20 13:35:09,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:09,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086303669] [2020-07-20 13:35:09,696 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:09,816 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:09,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:09,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:09,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:09,893 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 114 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2020-07-20 13:35:09,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:10,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,901 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 122 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2020-07-20 13:35:10,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086303669] [2020-07-20 13:35:10,902 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:10,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:35:10,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127239984] [2020-07-20 13:35:10,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:35:10,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:10,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:35:10,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:35:10,904 INFO L87 Difference]: Start difference. First operand 67 states and 104 transitions. Second operand 15 states. [2020-07-20 13:35:11,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:11,139 INFO L93 Difference]: Finished difference Result 107 states and 201 transitions. [2020-07-20 13:35:11,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:35:11,140 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-20 13:35:11,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:11,143 INFO L225 Difference]: With dead ends: 107 [2020-07-20 13:35:11,143 INFO L226 Difference]: Without dead ends: 100 [2020-07-20 13:35:11,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 245 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:35:11,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-20 13:35:11,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 70. [2020-07-20 13:35:11,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 13:35:11,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 112 transitions. [2020-07-20 13:35:11,156 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 112 transitions. Word has length 135 [2020-07-20 13:35:11,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:11,156 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 112 transitions. [2020-07-20 13:35:11,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:35:11,156 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 112 transitions. [2020-07-20 13:35:11,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-20 13:35:11,159 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:11,160 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:11,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:11,375 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:11,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:11,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1102424554, now seen corresponding path program 3 times [2020-07-20 13:35:11,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:11,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1164366565] [2020-07-20 13:35:11,377 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:11,512 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:11,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:11,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:11,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:11,624 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 114 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2020-07-20 13:35:11,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:12,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,175 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 130 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 13:35:13,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1164366565] [2020-07-20 13:35:13,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:13,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:35:13,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138494547] [2020-07-20 13:35:13,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:35:13,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:13,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:35:13,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:13,178 INFO L87 Difference]: Start difference. First operand 70 states and 112 transitions. Second operand 17 states. [2020-07-20 13:35:13,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:13,537 INFO L93 Difference]: Finished difference Result 107 states and 197 transitions. [2020-07-20 13:35:13,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:13,538 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 163 [2020-07-20 13:35:13,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:13,540 INFO L225 Difference]: With dead ends: 107 [2020-07-20 13:35:13,540 INFO L226 Difference]: Without dead ends: 75 [2020-07-20 13:35:13,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 297 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:35:13,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-20 13:35:13,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-20 13:35:13,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 13:35:13,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 115 transitions. [2020-07-20 13:35:13,550 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 115 transitions. Word has length 163 [2020-07-20 13:35:13,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:13,550 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 115 transitions. [2020-07-20 13:35:13,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:35:13,551 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 115 transitions. [2020-07-20 13:35:13,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-20 13:35:13,553 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:13,553 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:13,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:13,767 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:13,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:13,768 INFO L82 PathProgramCache]: Analyzing trace with hash -2102107778, now seen corresponding path program 4 times [2020-07-20 13:35:13,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:13,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1508119364] [2020-07-20 13:35:13,769 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:13,905 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:13,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:13,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:35:13,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:13,967 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 76 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2020-07-20 13:35:13,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:14,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,649 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 81 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2020-07-20 13:35:14,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1508119364] [2020-07-20 13:35:14,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:14,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 13:35:14,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330271893] [2020-07-20 13:35:14,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:35:14,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:14,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:35:14,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:35:14,657 INFO L87 Difference]: Start difference. First operand 75 states and 115 transitions. Second operand 13 states. [2020-07-20 13:35:14,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:14,836 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-20 13:35:14,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:14,839 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 136 [2020-07-20 13:35:14,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:14,841 INFO L225 Difference]: With dead ends: 107 [2020-07-20 13:35:14,841 INFO L226 Difference]: Without dead ends: 100 [2020-07-20 13:35:14,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 251 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:14,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-20 13:35:14,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 82. [2020-07-20 13:35:14,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 13:35:14,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 136 transitions. [2020-07-20 13:35:14,856 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 136 transitions. Word has length 136 [2020-07-20 13:35:14,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:14,857 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 136 transitions. [2020-07-20 13:35:14,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:35:14,857 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 136 transitions. [2020-07-20 13:35:14,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-20 13:35:14,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:14,860 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 8, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:15,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:15,062 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:15,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:15,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1316077641, now seen corresponding path program 5 times [2020-07-20 13:35:15,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:15,063 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698700156] [2020-07-20 13:35:15,064 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:15,222 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:15,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:15,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:15,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:15,300 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 106 proven. 98 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-07-20 13:35:15,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:15,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,378 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 108 proven. 104 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2020-07-20 13:35:16,379 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698700156] [2020-07-20 13:35:16,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:16,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:35:16,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835370676] [2020-07-20 13:35:16,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:35:16,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:16,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:35:16,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:35:16,383 INFO L87 Difference]: Start difference. First operand 82 states and 136 transitions. Second operand 15 states. [2020-07-20 13:35:16,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:16,616 INFO L93 Difference]: Finished difference Result 117 states and 203 transitions. [2020-07-20 13:35:16,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:35:16,617 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-20 13:35:16,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:16,618 INFO L225 Difference]: With dead ends: 117 [2020-07-20 13:35:16,619 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 13:35:16,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 271 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:35:16,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 13:35:16,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-20 13:35:16,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 13:35:16,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-20 13:35:16,632 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 148 [2020-07-20 13:35:16,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:16,633 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-20 13:35:16,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:35:16,633 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-20 13:35:16,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-20 13:35:16,636 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:16,636 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:16,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:16,852 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:16,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:16,853 INFO L82 PathProgramCache]: Analyzing trace with hash -872965087, now seen corresponding path program 6 times [2020-07-20 13:35:16,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:16,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1467708353] [2020-07-20 13:35:16,854 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:17,014 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:17,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:17,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:35:17,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:17,079 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 81 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 13:35:17,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:17,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,812 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 85 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 13:35:17,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1467708353] [2020-07-20 13:35:17,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:17,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 13:35:17,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205460829] [2020-07-20 13:35:17,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:35:17,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:17,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:35:17,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:35:17,814 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-20 13:35:17,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:17,984 INFO L93 Difference]: Finished difference Result 114 states and 190 transitions. [2020-07-20 13:35:17,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:17,985 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 149 [2020-07-20 13:35:17,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:17,987 INFO L225 Difference]: With dead ends: 114 [2020-07-20 13:35:17,987 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 13:35:17,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 277 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:17,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 13:35:17,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 80. [2020-07-20 13:35:17,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 13:35:17,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-20 13:35:17,998 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 149 [2020-07-20 13:35:17,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:17,999 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-20 13:35:17,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:35:17,999 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-20 13:35:18,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-20 13:35:18,001 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:18,001 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:18,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:18,209 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:18,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:18,210 INFO L82 PathProgramCache]: Analyzing trace with hash -529934979, now seen corresponding path program 7 times [2020-07-20 13:35:18,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:18,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894328367] [2020-07-20 13:35:18,211 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:18,359 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:18,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:18,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:35:18,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:18,415 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 141 proven. 34 refuted. 0 times theorem prover too weak. 369 trivial. 0 not checked. [2020-07-20 13:35:18,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:18,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:18,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:19,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:19,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:19,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:19,242 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 143 proven. 37 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 13:35:19,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894328367] [2020-07-20 13:35:19,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:19,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 13:35:19,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778554153] [2020-07-20 13:35:19,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:35:19,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:19,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:35:19,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:35:19,245 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-20 13:35:19,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:19,404 INFO L93 Difference]: Finished difference Result 106 states and 183 transitions. [2020-07-20 13:35:19,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:19,404 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 150 [2020-07-20 13:35:19,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:19,406 INFO L225 Difference]: With dead ends: 106 [2020-07-20 13:35:19,406 INFO L226 Difference]: Without dead ends: 99 [2020-07-20 13:35:19,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 279 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:19,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-20 13:35:19,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2020-07-20 13:35:19,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-20 13:35:19,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 161 transitions. [2020-07-20 13:35:19,419 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 161 transitions. Word has length 150 [2020-07-20 13:35:19,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:19,420 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 161 transitions. [2020-07-20 13:35:19,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:35:19,420 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 161 transitions. [2020-07-20 13:35:19,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2020-07-20 13:35:19,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:19,423 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 9, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:19,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:19,638 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:19,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:19,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1102006884, now seen corresponding path program 8 times [2020-07-20 13:35:19,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:19,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378577461] [2020-07-20 13:35:19,640 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:19,796 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:19,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:19,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:19,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:19,893 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 185 proven. 49 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 13:35:19,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:20,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:20,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:20,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:20,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:20,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:20,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:20,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:20,980 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 187 proven. 55 refuted. 0 times theorem prover too weak. 414 trivial. 0 not checked. [2020-07-20 13:35:20,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378577461] [2020-07-20 13:35:20,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:20,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:35:20,981 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48639921] [2020-07-20 13:35:20,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:35:20,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:20,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:35:20,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:35:20,983 INFO L87 Difference]: Start difference. First operand 92 states and 161 transitions. Second operand 15 states. [2020-07-20 13:35:21,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:21,200 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-20 13:35:21,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:35:21,206 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 162 [2020-07-20 13:35:21,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:21,208 INFO L225 Difference]: With dead ends: 117 [2020-07-20 13:35:21,208 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 13:35:21,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 299 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:35:21,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 13:35:21,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 96. [2020-07-20 13:35:21,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-20 13:35:21,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 158 transitions. [2020-07-20 13:35:21,219 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 158 transitions. Word has length 162 [2020-07-20 13:35:21,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:21,219 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 158 transitions. [2020-07-20 13:35:21,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:35:21,220 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 158 transitions. [2020-07-20 13:35:21,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-20 13:35:21,222 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:21,222 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:21,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:21,438 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:21,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:21,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1920867700, now seen corresponding path program 9 times [2020-07-20 13:35:21,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:21,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [724919612] [2020-07-20 13:35:21,440 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:21,603 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:21,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:21,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:35:21,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:21,680 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 37 refuted. 0 times theorem prover too weak. 479 trivial. 0 not checked. [2020-07-20 13:35:21,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:22,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,462 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 43 refuted. 0 times theorem prover too weak. 473 trivial. 0 not checked. [2020-07-20 13:35:22,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [724919612] [2020-07-20 13:35:22,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:22,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 13:35:22,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387026428] [2020-07-20 13:35:22,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:35:22,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:22,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:35:22,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:35:22,465 INFO L87 Difference]: Start difference. First operand 96 states and 158 transitions. Second operand 13 states. [2020-07-20 13:35:22,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:22,637 INFO L93 Difference]: Finished difference Result 129 states and 217 transitions. [2020-07-20 13:35:22,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:22,641 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 163 [2020-07-20 13:35:22,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:22,643 INFO L225 Difference]: With dead ends: 129 [2020-07-20 13:35:22,643 INFO L226 Difference]: Without dead ends: 122 [2020-07-20 13:35:22,644 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 305 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:22,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-20 13:35:22,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 93. [2020-07-20 13:35:22,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-20 13:35:22,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-20 13:35:22,654 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 163 [2020-07-20 13:35:22,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:22,655 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-20 13:35:22,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:35:22,655 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-20 13:35:22,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2020-07-20 13:35:22,658 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:22,658 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 9, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:22,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:22,871 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:22,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:22,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1607241826, now seen corresponding path program 10 times [2020-07-20 13:35:22,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:22,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115105555] [2020-07-20 13:35:22,872 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:23,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:23,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:23,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:35:23,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:23,105 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 32 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2020-07-20 13:35:23,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:23,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:23,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:23,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:23,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:23,650 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 34 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2020-07-20 13:35:23,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115105555] [2020-07-20 13:35:23,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:23,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 13:35:23,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246355047] [2020-07-20 13:35:23,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:35:23,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:23,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:35:23,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:35:23,652 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 11 states. [2020-07-20 13:35:23,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:23,788 INFO L93 Difference]: Finished difference Result 131 states and 225 transitions. [2020-07-20 13:35:23,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:35:23,789 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 164 [2020-07-20 13:35:23,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:23,792 INFO L225 Difference]: With dead ends: 131 [2020-07-20 13:35:23,792 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 13:35:23,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 311 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:23,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 13:35:23,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 95. [2020-07-20 13:35:23,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-07-20 13:35:23,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 157 transitions. [2020-07-20 13:35:23,802 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 157 transitions. Word has length 164 [2020-07-20 13:35:23,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:23,803 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 157 transitions. [2020-07-20 13:35:23,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:35:23,803 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 157 transitions. [2020-07-20 13:35:23,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2020-07-20 13:35:23,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:23,805 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:24,018 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:24,019 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:24,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:24,020 INFO L82 PathProgramCache]: Analyzing trace with hash -315995755, now seen corresponding path program 11 times [2020-07-20 13:35:24,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:24,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1735241884] [2020-07-20 13:35:24,021 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:24,221 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:24,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:24,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:35:24,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:24,337 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 168 proven. 41 refuted. 0 times theorem prover too weak. 568 trivial. 0 not checked. [2020-07-20 13:35:24,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:24,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:24,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:24,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:24,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:24,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:25,132 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 170 proven. 43 refuted. 0 times theorem prover too weak. 564 trivial. 0 not checked. [2020-07-20 13:35:25,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1735241884] [2020-07-20 13:35:25,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:25,133 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 13:35:25,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654007695] [2020-07-20 13:35:25,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:35:25,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:25,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:35:25,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:35:25,136 INFO L87 Difference]: Start difference. First operand 95 states and 157 transitions. Second operand 13 states. [2020-07-20 13:35:25,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:25,304 INFO L93 Difference]: Finished difference Result 110 states and 175 transitions. [2020-07-20 13:35:25,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:25,305 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 176 [2020-07-20 13:35:25,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:25,307 INFO L225 Difference]: With dead ends: 110 [2020-07-20 13:35:25,307 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 13:35:25,308 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 331 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:25,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 13:35:25,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 93. [2020-07-20 13:35:25,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-20 13:35:25,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-20 13:35:25,318 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 176 [2020-07-20 13:35:25,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:25,318 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-20 13:35:25,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:35:25,318 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-20 13:35:25,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2020-07-20 13:35:25,321 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:25,322 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 11, 11, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:25,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:25,536 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:25,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:25,537 INFO L82 PathProgramCache]: Analyzing trace with hash -854759576, now seen corresponding path program 12 times [2020-07-20 13:35:25,537 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:25,537 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [624994034] [2020-07-20 13:35:25,537 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:25,723 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:25,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:25,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:25,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:25,813 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 45 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2020-07-20 13:35:25,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:26,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:27,025 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 55 refuted. 0 times theorem prover too weak. 632 trivial. 0 not checked. [2020-07-20 13:35:27,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [624994034] [2020-07-20 13:35:27,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:27,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:35:27,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530078423] [2020-07-20 13:35:27,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:35:27,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:27,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:35:27,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:35:27,027 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 15 states. [2020-07-20 13:35:27,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:27,232 INFO L93 Difference]: Finished difference Result 123 states and 202 transitions. [2020-07-20 13:35:27,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:35:27,234 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 191 [2020-07-20 13:35:27,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:27,235 INFO L225 Difference]: With dead ends: 123 [2020-07-20 13:35:27,236 INFO L226 Difference]: Without dead ends: 116 [2020-07-20 13:35:27,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 357 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:35:27,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-20 13:35:27,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 101. [2020-07-20 13:35:27,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-20 13:35:27,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 173 transitions. [2020-07-20 13:35:27,254 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 173 transitions. Word has length 191 [2020-07-20 13:35:27,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:27,254 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 173 transitions. [2020-07-20 13:35:27,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:35:27,255 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 173 transitions. [2020-07-20 13:35:27,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2020-07-20 13:35:27,257 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:27,258 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 12, 11, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:27,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:27,471 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:27,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:27,472 INFO L82 PathProgramCache]: Analyzing trace with hash -31808317, now seen corresponding path program 13 times [2020-07-20 13:35:27,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:27,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1665409129] [2020-07-20 13:35:27,473 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:27,667 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:27,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:27,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:27,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:27,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 100 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-07-20 13:35:27,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:28,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:28,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:28,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:28,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:29,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:29,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:29,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:29,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:29,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:29,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:29,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:29,459 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 116 refuted. 0 times theorem prover too weak. 687 trivial. 0 not checked. [2020-07-20 13:35:29,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1665409129] [2020-07-20 13:35:29,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:29,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:35:29,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183110068] [2020-07-20 13:35:29,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:35:29,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:29,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:35:29,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:29,462 INFO L87 Difference]: Start difference. First operand 101 states and 173 transitions. Second operand 17 states. [2020-07-20 13:35:29,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:29,758 INFO L93 Difference]: Finished difference Result 121 states and 205 transitions. [2020-07-20 13:35:29,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:29,758 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 204 [2020-07-20 13:35:29,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:29,761 INFO L225 Difference]: With dead ends: 121 [2020-07-20 13:35:29,761 INFO L226 Difference]: Without dead ends: 114 [2020-07-20 13:35:29,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 379 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:35:29,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-20 13:35:29,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 93. [2020-07-20 13:35:29,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-20 13:35:29,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 161 transitions. [2020-07-20 13:35:29,771 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 161 transitions. Word has length 204 [2020-07-20 13:35:29,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:29,772 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 161 transitions. [2020-07-20 13:35:29,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:35:29,772 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 161 transitions. [2020-07-20 13:35:29,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-20 13:35:29,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:29,775 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:29,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:29,990 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:29,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:29,991 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 14 times [2020-07-20 13:35:29,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:29,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775567939] [2020-07-20 13:35:29,992 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:30,189 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:30,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 13:35:30,190 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:35:30,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 13:35:30,225 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:35:30,261 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 13:35:30,261 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 13:35:30,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:30,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:35:30 BoogieIcfgContainer [2020-07-20 13:35:30,529 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:35:30,531 INFO L168 Benchmark]: Toolchain (without parser) took 41271.40 ms. Allocated memory was 144.7 MB in the beginning and 551.6 MB in the end (delta: 406.8 MB). Free memory was 102.5 MB in the beginning and 151.1 MB in the end (delta: -48.6 MB). Peak memory consumption was 358.3 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:30,532 INFO L168 Benchmark]: CDTParser took 0.42 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 13:35:30,532 INFO L168 Benchmark]: CACSL2BoogieTranslator took 405.97 ms. Allocated memory is still 144.7 MB. Free memory was 102.1 MB in the beginning and 92.7 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:30,533 INFO L168 Benchmark]: Boogie Preprocessor took 185.26 ms. Allocated memory was 144.7 MB in the beginning and 202.9 MB in the end (delta: 58.2 MB). Free memory was 92.5 MB in the beginning and 181.4 MB in the end (delta: -88.9 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:30,533 INFO L168 Benchmark]: RCFGBuilder took 397.82 ms. Allocated memory is still 202.9 MB. Free memory was 181.4 MB in the beginning and 168.7 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:30,533 INFO L168 Benchmark]: TraceAbstraction took 40266.63 ms. Allocated memory was 202.9 MB in the beginning and 551.6 MB in the end (delta: 348.7 MB). Free memory was 168.0 MB in the beginning and 151.1 MB in the end (delta: 16.9 MB). Peak memory consumption was 365.5 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:30,535 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.42 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 405.97 ms. Allocated memory is still 144.7 MB. Free memory was 102.1 MB in the beginning and 92.7 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 185.26 ms. Allocated memory was 144.7 MB in the beginning and 202.9 MB in the end (delta: 58.2 MB). Free memory was 92.5 MB in the beginning and 181.4 MB in the end (delta: -88.9 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 397.82 ms. Allocated memory is still 202.9 MB. Free memory was 181.4 MB in the beginning and 168.7 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 40266.63 ms. Allocated memory was 202.9 MB in the beginning and 551.6 MB in the end (delta: 348.7 MB). Free memory was 168.0 MB in the beginning and 151.1 MB in the end (delta: 16.9 MB). Peak memory consumption was 365.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 6; VAL [x=6] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=6] [L8] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L10] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=5] [L18] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L20] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=5, fibo1(n-1)=3, n=5] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=5, fibo1(n-1)=3, fibo1(n-2)=2, n=5] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=6, fibo2(n-1)=5, n=6] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=6, fibo2(n-1)=5, fibo2(n-2)=3, n=6] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=8, x=6] [L37] int result = fibo1(x); [L38] COND TRUE result == 8 VAL [result=8, x=6] [L39] __VERIFIER_error() VAL [result=8, x=6] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 40.0s, OverallIterations: 27, TraceHistogramMax: 18, AutomataDifference: 5.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 635 SDtfs, 1042 SDslu, 3546 SDs, 0 SdLazy, 3602 SolverSat, 849 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 6247 GetRequests, 5623 SyntacticMatches, 225 SemanticMatches, 399 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 5.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=101occurred in iteration=25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 26 MinimizatonAttempts, 424 StatesRemovedByMinimization, 23 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 24.3s InterpolantComputationTime, 3264 NumberOfCodeBlocks, 2955 NumberOfCodeBlocksAsserted, 93 NumberOfCheckSat, 6097 ConstructedInterpolants, 0 QuantifiedInterpolants, 1531967 SizeOfPredicates, 132 NumberOfNonLiveVariables, 6411 ConjunctsInSsa, 264 ConjunctsInUnsatCore, 50 InterpolantComputations, 2 PerfectInterpolantSequences, 19515/23532 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...